CVE-2026-3593
High · 7.4CVSS
7.4
EPSS
1.1%
Published
May 20, 2026
CISA due date
—
The record
A use-after-free vulnerability exists within the DNS-over-HTTPS implementation. This issue affects BIND 9 versions 9.20.0 through 9.20.22, 9.21.0 through 9.21.21, and 9.20.9-S1 through 9.20.22-S1. BIND 9 versions 9.18.0 through 9.18.48 and 9.18.11-S1 through 9.18.48-S1 are NOT affected.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| openSUSE:Leap 16.0 | bind | 0 | 9.20.23-160000.1.1 |
| openSUSE:Tumbleweed | bind | 0 | 9.20.23-2.1 |
Related vulnerabilities
- CVE-2026-5950 An unbounded resend loop vulnerability exists in the BIND 9 resolver state machine during… Also affects bind
- CVE-2026-5947 Undefined behavior may result due to a race condition leading to a use-after-free… Also affects bind
- CVE-2026-5946 Multiple flaws have been identified in `named` related to the handling of DNS messages… Also affects bind
- CVE-2026-3039 BIND servers that are configured to use TKEY-based authentication via GSS-API tokens are… Also affects bind
- CVE-2026-3592 BIND resolvers are vulnerable to an amplified resource consumption/exhaustion attack. Also affects bind
- CVE-2026-3119 Under certain conditions, `named` may crash when processing a correctly signed query… Also affects bind
- CVE-2026-3591 A use-after-return vulnerability exists in the `named` server when handling DNS queries… Also affects bind
- CVE-2026-3104 A specially crafted domain can be used to cause a memory leak in a BIND resolver simply… Also affects bind